<template>
	<view>
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !==0">
      <view class="sugg-item" v-for="(item, i) in searchResults":key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item , i) in histories" :key='i' @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
        kw:'',
        // 搜索结果列表
        searchResults: [],
        // 搜索历史的数组
        historyList: []
			};
		},
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      // input输入事件的处理函数
      input(e) {
        // 防抖处理
        // 清除 timer 对应的延时器
        clearTimeout(this.timer)
        // 重新启动一个延时器，并把timerId 赋值给 this.timer
        this.timer = setTimeout(() => {
          // 如果500毫秒内，没有触发新的输入事件，则为搜索关键词赋值
          console.log(e.valueOf())
          this.kw = e.value
          this.getSearchList()
        },500)
      },
      async getSearchList() {
        // 判断搜索关键词是否为空
        if(this.kw.length === 0) {
          this.searchResults = []
          return
        }
        const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{ query:this.kw })
        if(res.meta.status !==200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      gotoDetail(item) {
        console.log(item.goods_id)
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id='+ item.goods_id
        })
      },
      saveSearchHistory() {
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        
        // 对搜索历史进行持久化的存储
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      clean() {
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(kw) {
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    },
    computed: {
      histories() {
       return [...this.historyList].reverse()
      }
    }
	}
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}

.sugg-list {
  padding: 0 5px;
  .sugg-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name {
      // 文字不允许换行(单行文本)
      white-space: nowrap;
      // 溢出部分隐藏
      overflow: hidden;
      // 溢出后用...代替
      text-overflow: ellipsis;
    }
  }
}

.history-box {
  padding: 0 5px;
  .history-title {
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list {
    display: flex;
    flex-wrap: wrap;
    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
